sg = float(input("身高："))
tz = float(input("体重："))
bmi = tz / (sg ** 2)
if bmi < 18.5:
    print("过轻")
elif 18.5 <= bmi <= 23.9:
    print("正常")
elif 24 <= bmi <= 27:
    print("正常")

elif 28 <= bmi <= 32:
    print("正常")
else:
    print("")
